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题型：翻译 题类：常考题 难易度：普通
人教版（新课程标准）高中英语必修3 Unit 4 Astronomy: the science of the stars 同步练习3
他们注意到一个塑料袋在空中漂浮着。
It looked {#blank#}1{#/blank#} {#blank#}2{#/blank#} the water isn't clean enough to swim here.
The slave was lucky enough to {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.
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